public Image this[int index] {
get {
if (index < 0 || index >= Count)
{
throw new ArgumentOutOfRangeException(SR.GetString(SR.InvalidArgument,
"index",
index.ToString()));
}
return(owner.GetBitmap(index));
}
set {
if (index < 0 || index >= Count)
{
throw new ArgumentOutOfRangeException(SR.GetString(SR.InvalidArgument,
"index",
index.ToString()));
}
if (value == null)
{
throw new ArgumentNullException("value");
}
if (!(value is Bitmap))
{
throw new ArgumentException(SR.GetString(SR.ImageListBitmap));
}
AssertInvariant();
Bitmap bitmap = (Bitmap)value;
if (owner.UseTransparentColor)
{
// Since there's no ImageList_ReplaceMasked, we need to generate
// a transparent bitmap
Bitmap source = bitmap;
bitmap = (Bitmap)bitmap.Clone();
bitmap.MakeTransparent(owner.transparentColor);
}
IntPtr hMask = ControlPaint.CreateHBitmapTransparencyMask(bitmap);
IntPtr hBitmap = ControlPaint.CreateHBitmapColorMask(bitmap, hMask);
bool ok = SafeNativeMethods.ImageList_Replace(new HandleRef(owner, owner.Handle), index, new HandleRef(null, hBitmap), new HandleRef(null, hMask));
SafeNativeMethods.DeleteObject(new HandleRef(null, hBitmap));
SafeNativeMethods.DeleteObject(new HandleRef(null, hMask));
if (!ok)
{
throw new InvalidOperationException(SR.GetString(SR.ImageListReplaceFailed));
}
}
}
